Automatic work driving device



June 30, 1936. 'H E. BALSIGER" AUTOMATIC WORK DRI VING DEVICE 5Sheets-Sheet l Filed Nov. 10, 1932 INVENTOR Meow EBALG/q'fi June 30,1936. H, BALSIG'ER 2,046,238

AUTOMATIC WORK DRIVING DEVICE Fil ed Nov. 10, 1952 5 Sheets-Sheet'ZINVENTOR am 501.64 gm.

June 30,1936. H. E. BALSIGER AUTOMATIC WORK DRIVING DEVICE Filed Nov.10, 1932 5 Sheets-Sheet 3 'INVENTOR QwEBusiqmJ I I I June 30, 1936. v H,ER 2,046,238

AUTOMATIC WORK D RIVI-NG DEVICE I Filed Nov. 10,1952 5 Sheets-Sheet 4INVENTOR Momma/km. I

June 30, 1936. 4 'H BALSIGER 7 2,046,238

AUTOMATIC WORK DRIVING DEVICE Filed Nov. 10, 1932 5 Sheets-Sheet 5INVENTOR 7 M20: [Baas/95R.

Patented June 30, 1936 5 i UNITED STATES AUTOMATIC WORK DRIVING DEVICE 7Harold E. Balsiger, Waynesboro, Pa., assignor to Landis Tool Company,Waynesboro, Pa., a corporation of Pennsylvania 7 Application November10, 1932, Serial No.642,101

6 Claims.

This invention relates to work holding and driving mechanism and itsobject is to provide a-work drive device which will operate to hold thework correctly and drive it correctly regardless of certain inaccuracieseither in the shape or in the position of the work.

A further object is to provide a work driving device which isautomatically operated and in which the work may be placed withoutstopping rotation of the headstock.

Further objects and advantages will become apparent from the descriptionwhich follows.

Referring to the accompanying drawings which are made a part hereof andon which similar reference characters indicate similar parts,

Figure 1 is a front view of the device with a cover plate removed,

Figure 2, a section on line 22 of Figure 1,

Figure 3, a section on line 33 of Figure 1,

Figure 4, a section similar to Figure 3 showing the device clamped onwork which is neither straight nor concentric,

Figure 5, a face view of Figure 4,

Figure 6, a front view showing a relatively large piece of work inposition with the device in clamped or driving position,

Figure '7, a view similar to Figure 6 with the work in unclampedposition,

Figures 8, 9, 10 and 11 are detail views of the several parts of thechuck,

Figure 12 is a side elevation of friction means for operating thedevice, and

Figure 13, a side elevation showing a foot pedal control for. operatingthe device.

In the drawings numeral 20 indicates a face plate which is carried by afootstock spindle l9. The spindle may be either of the live or deadspindle type, that shown being preferably of the dead spindle type. Adriving ring 2| is secured upon the face plate 20 by means of screws 22.The ring 2| also carries pins 23 upon which are mounted rollers 24 whichrollers are adapted to drive the work holding dog 25 as will be morefully described hereafter. A dog opening finger 26 is pivotally mountedupon a pin 21 which pin is fixed in the ring 2|. The driving ring 2|also carries radial pins 28 which are fixed in its periphery. These pinshave a flattened surface on their outer ends against which seat springs29. These springs also seat against surface 30 on the interior of afriction release ring 3|. The finger 26 extends through a notch in thering 2| and engages a notch 32 in the friction release ring 3|. Afriction band 33 is anchored at 34 to the base of the machine andsecured at 35 to an operating lever 36 which is pivotally attached tothe bed of the machine at 31. The lever 36 is operated by means of afoot pedal 38 and a connecting link The work driving dog 25 has twoopposed notches 40 in which the driving rollers 24 engage. The dog 25 isloosely fitted within the driving ring 2| to allow for movement of thedog to clamp work which is out of parallel with the axis of the centerH! or which may not be perfectly round. The dog 25 has a block 4|secured to one face by means of a pin 42. The inner end of this block isV-shaped so as to engage a work piece 5|. A cooperating clamping jaw .43is. pivotally attached by a screw 44 to the dog and is urged toward workengaging position by means of a' spring 45. The spring 45 is positionedabout'suitable guide pins 46 to hold it in place. When the dog is inassembled position the dog opening finger 26 fits loosely betweenclamping jaw 43 and a surface 4'! on the dog with the driving rollers 24positioned loosely in the notches 46. A cover plate 48 is held inposition by screws 49 to hold the entire assembly together, the coverplate being provided with a hole 50 through which the work may enterinto the dog or work driving device. V r

In' operation, the parts normally rotate in a counterclockwisedirection. 'When the dog is to be opened to insert work therein or toremove work therefrom the foot pedal 38 is operated. This brings thebands 33 into frictional contact with friction release ring 3| to retardrotation of this ring, the ring 2|, however, continues to rotate.Rotation of the ring 2| faster than the ring 3| moves the finger 26toward the right and thus pushes the clamping jaw 43 away from thesurface 41, thus opening the work driving jaws to permit removal of thework or to position new work within the jaws. The friction release ring3| is moved against the tension of the springs 29. As soon as the footpedal 38 is released the springs 29 will bring the rings 2| and 3| intosuch a position that the finger 26 will release the movable dog 43 toallow the parts to assume work clamping position. From the descriptiongiven it will be apparent that the device may be opened with outstopping rotation'of the headstock and that the opening is automatic. InFigures 4 and 5 the work piece 5| is not in axial alignment with thework center. The work drive dog 25 is shown in a position at which ithas adapted itself to the position of the work, i. e. the dog is not ina plane which is parallel with the face plate 20 and the ring 2| and theassociated parts. This device shows the adaptability of the device.

In Figure 5 the work is shown to be off center,

the work driving device has shifted to adapt itself to this position ofthe work; To adapt the device for use with work, of difierent sizes itis necessary only to change the V-blocks 4] and the movable dogs 43 asshown in Figures 6, and 7.

. In Figure 6 a relatively short V-block '52 is applied to the dog and amovable jaw 53 having a'suit'able cut-out portion 54 is pivotallyadapted to the resilient means for moving the movablefljaw to dog] Inother respects the parts of the device are unchanged; ,7

'11; will be obvious to'thoseskilled some art that various changesmaybemadein' my device without departing from the spirit of the 'inveiiftion and therefore I do not limit myselt to what is shown in thedrawings 'anddescribedv in the specification, but only as indicated inthe appended claims, 1 v

' Having thus fullydescribedgmy said invention, what Lclaim as new anddesire to. secure by Letters'Patent, I L

J 1. A work driving device comprising a spindle, a faceplatesecuredthereoma driving-ring secured to, the face plate, a drivingdog mounted within the. driving ring, said driving dog having opposednotches therein, rollersmounted'on the driving. ring engageable in saidnotches for driving thedog from the driving, ring, a stationary jaw onthe driving dog, ,amovable jaw cooperating with the stationaryjaw'forgripping the work,

work gripping .position, afinger mounted on the I driving ring. movableto engage the movable jawv to release the. work, a friction release ringpositionedabout thedrivingring, saidfriction releasering having a notchinto which one end of [the saidfinger engages, the friction release ring40;-

being normally rotated with the driving ring duringoperaticnotthemachine, and afriction driving the dogirom the driving ring, astabrake engageable with ,thefriction releasering to retard its motion,such retardation causing the said finger to movethemovable work engagingjaw out of contact with the work, substan tially as set forth. I l r 2.A work driving device comprising a spindle, a face plate secure-dthereon, a driving ring secured to the face plate, a driving 'dog'mounted within the driving'ringfsaid driving 'dog having opposednotchestherein, rollers mounted on,

the'drivingring engageablein said notches for 1 'tionary 'jaw onthedriving dog, a movablerjaw which one end of the said finger engages, the

cooperating with "the stationary jaw for grip *ping the work, resilientmeans for moving the movable jaw to work gripping position; a fingermounted on the driving-ring movable 'to' engage the movable jaw torelease the work, a friction release ring positioned about the drivingring, said friction release 'ring having a notch into friction releasering being normallyrotated with the driving ring 'during' operation ofthe machine, and a friction brake engageable withthe frictionreleasering to retard its motion, such,

retardation causing the said finger to move the movable work engagingjaw out of contact with the work, said work engaging dog being looselymounted in the saidjdriving ring whereby it may, align itself with thework which is out of perfect alignment with the spindle and when work isnonconcentric and inaccurate in shape, substantially as set forth. a 7 i3. A work driving device comprisinga plate having a fixed and a movablework engaging jaw thereon, resilient means for' urging the movable jawto work engaging position, means for supporting and driving said plate,a fingenmounted on'said last named means'en ageable with said movablejaw to move it to'swork releasing posi-' tion and a frictionring mountedon said driving l means and resiliently driven thereby and engage:

able with said finger when the ringis retarded y'inits rotation andmeansfor retarding rotation of said ring to releaseI the work. 7

"45A work driving-device comprising a, plate "havingfa fixed andamovablework engaging jaw "thereon, resilient means mounted on said plate forurging the'movable jaw vto work engaging a I V 7 position, a plate forsupporting and driving said first named plate, means on said last namedplate engageable'with notches in saidfirst named plate for driving'the,first, plate by the second;

Vmeans for securing said first named plate against axial movement; saidlast named, means providing. suflicient; clearance to permit an axialfloat of the first plate relative to the, second plate, a ring,

mountedon said secondplate and resiliently driven thereby,said ringrotating'normally with,

said plates, work releasing means means on said ring for engagingworkreleasing, means when ro-f tation ofsaid ring is retarded relativeto rotation o'fithev said plates and; friction; means engageable withsaidq-ring ior retarding its jrotation tore- V providing afclearancetopermit axial floating of one plate with respect totheothena movable anda fixed work engaging jaw mounted onv the driven plate, resilient; means,mountedton the engaging position, means on thedriving plate drivenplate for moving 'themovable jaw to work engageable-withthe movable workengaging jaw' to move it to work releasing-position, saidlast namedmeans being engageable byv said'ring to its rotation with 'said platesand for retarding rotation" of said ring,

6. A device of the kind describe release the work when said ring .isretarded in' friction means (1 comprising a floating work driving dog.havingja movable and. r

a fixed work engaging j aw mounted thereon, a plate for supporting anddriving said dog, means.

onsaid plate engageable ,with said movable'jaw for releasing the work,means on said dog for.

holding'said jaws'in work'grippin position, a1 ring mounted on saidplate and 'being resiliently driven therebyysaid ring being;.engageablewith said jaw releasingmeans upon a retardation'joithe rotationof saidring with respect to'the rotation of the plate, and friction meansengageable with said ring for retardingits rotation to re-i leasethe'work.

V, w HARQLD E. BALSIGER.

